Batch) Value for '/c' option cannot be more than 253 characters

Question

I'm trying to move the file to the desired path using the Windows batch script. (.bat) However, this error occurs and the code is not performed.

value for '/c' option cannot be more than 253 characters

I haven't found a way to solve this. How can I fix this code?

forfiles /p %sourceDir% /d %date% /c "cmd /c if exist %backupDir%\@file ( echo @file 'Backup File Found' ) else ( if exist %targetDir%\@file ( echo @file 'Target File Found' ) else ( if /i @ext==\"partial\" ( echo @file 'Download is in progress' ) else ( copy @file %targetDir% ) ) )"